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Find the probability that there are less than 3 defective watches in a box.

Forums: Probability
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LOLA SOLNCE
 
Reply Fri 21 Jun, 2013 07:39 am
A factory manufactures watches and 100 watches are packed in a box.
The probability that a watch is defective is given by 0.004.
Find the probability that there are less than 3 defective watches in a box.
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Type: Question • Score: 0 • Views: 948 • Replies: 1
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Hanniford
 
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Reply Sat 14 Sep, 2013 05:32 pm
@LOLA SOLNCE,
The expected number of defects in the box is 0.4
The cumulative Poisson probability for X < 3 = 0.99207
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